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1. The world’s busiest air route

Not quite. The most crowded flight path on Earth, according to aviation analyst OAG, is actually the 280-mile hop from Seoul Gimpo (stop sniggering) to Jeju International, the gateway to a Unesco-listed island billed as South Korea’s answer to Hawaii. A staggering 13,460,306 passenger journeys were made between the two airports in 2017; by comparison, less than three million travelled between Heathrow and New York’s JFK.

Second on its list is Melbourne-Sydney, with 9,090,941, while third place goes to Sapporo-Tokyo...